Magneto



Feb. 18, w F, BQRGERD ETAL 2,232,509

MAGNETO Filed Sept. 27, 1938 4 Sheets-Sheet l Feb. 18', 1941. w. F. BORGERD ETAL 2,232,509

MAGNETQ Filed Sept. 27, 1938 4 Sheets-Sheet 2 Feb. 18, 1941. w. F. BORGERD ETAL MAGNETO Filed Sept. 27, 1938 4 Sheets-Sheet 3 ll/FB PA/g6) Feb. 18, 1941. w. F. BORGERD ETAL 2,232,509

Patented Feb. 18, 1941 UNITED STATES MAGNE'DO William F. Borgerd, Riverside, and Harold E.

Knopp and Philip L. Berton, Chicago, 111., assignors to International Harvester Company, a corporation of New Jersey Application September 27, 1938, Serial No. 231,946

20 Claim.

This invention relates to magnetos and more particularly to high tension magnetos adapted to be attached directly to the housing of an internal combustion engine.

One of the objects of the present invention is to provide an improved housing structure which will permit access to the functional parts of the magneto, which may be readily assembled in properly timed relation.

More specifically, an object of the invention is to mount the drive gearing for the distributor on a removable casing member whereby the interior of the magneto may be inspected without disengaging the timing gears.

Another object is to simplify the magneto structure and to reduce the number and cost of parts by mounting the breaker mechanism directly around the armature shaft within the magneto housing and to construct the distributor drive and gearing as a unitary assembly removable from the magneto for access to the breaker mechanism.

Another object is to provide an enclosed compartment for the distributor driving gearing whereby it may be satisfactorily lubricated and whereby the oxidizing atmosphere created by distributor sparking cannot gain access thereto.

These objects and others, which will be apparent from an inspection of the following application, when read with reference to the accompanying drawings, illustrate two preferred embodiments of the invention.

In the drawings:

Figure 1 is a vertical longitudinal section through a magneto incorporating the diflerent features of the invention;

Figure 2 is the same view with the removable portion of the magneto taken off to show the line of division and the means by which the distributor gearing may be readily disengaged;

Figure 3 is a view of the removed distributor assembly;

Figure 4 is a view of the distributor cap removed as a single unit for access to the distributor mechanism;

Figure 5 is a front end view of the magneto shown in Figure 2;

Figure 6 is an elevation taken from the magneto attaching end of the distributor assembly shown in Figure 3; and,

Figure 7 is a view similar to Figure l of a modified construction with only the significant elements shown in section, the remainder being in elevation.

As shown in the drawings, the magneto housing it is secured to an attaching member II, which is provided with a flange i2 for securing the magneto directly over an opening in the crank case of an engine. Openings IS in the flange II are illustrated, through which cap detail.

screws pass for securing the flange in position. This construction is well known and is widely used at the present time.

An armature shaft i4 carrying a permanent magnet IQ of any conventional construction is rotatably mounted in the housing ill by means of a ball bearing assembly It at the front end and a ball bearing assembly I] at the rear end. These assemblies are suitably supported in cylindrical recesses formed in the housing iii.

The shaft it extends into the attaching plate il, being provided with a tapered gear mounting surface It, which is adapted to receive a driving gear to be driven from gearing in timed relation with the crank shaft of an engine.

The top of the housing I0 is open to provide for mounting a coil II and the necessary pole pieces 20 which extend upwardly, being connected by a core 2i extending through the coil l3. All of this construction is conventional in the art and has not been shown or described in A cover member 22 is fitted on a flange 23 formed around the top of the housing i0 and is secured thereto by any suitable means. A high tension conductor 24 leads from the coil I9 to a screw 25, which connects said conductor to a high tension terminal 26 molded into the cover member 22 which is formed of a molded insulating composition. The usual condenser 21 is shown fitted in a recess formed in the housing Ill.

The end of the housing l0 opposite to the attaching plate ii is open and is formed with a chamber 28, around which a surfaced flange 29 is provided. A closure and supporting member 30 is provided with a surfaced attaching means in the form of a flange 3i, which closely fits on the flange 29. Means, one of which is shown as a screw 3i, are provided for rigidly securing the cover member 30 against the housing in.

The member 30 is .provided with a recessed portion 32 cooperating with the chamber 28 formed in the housing iii to provide a compartment for the breaker mechanism. The armature shaft I3 extends through said compartment, being provided with a cam portion 33 for operating the contacts 34 of the breaker assembly. A portion of the breaker assembly is shown to illustrate the position of the breaker mechanism in the compartment. A breaker arm 34 carries the means for contacting the earns 33. A portion of a breaker mechanism support 35 is shown, to which a low tensioned conductor 36 is connected. Said support is mounted on an extension 25' of the housing iii. The breaker is 0perated in the usual manner to make and break the circuit on the low tension side of the magneto at the proper timed intervals.

The cover member 30 also serves as a carrier for the driving gears for a distributor assembly including a distributor member 31. Said distributor is rotatably mounted on a bearing pin 38, a bearing sleeve 39. being provided in the molded distributor, which is of some suitable insulating material. The bearing pin 38 is provided with a head portion 40, which is rigidly secured to an attaching member 4|. Said member consists of a vertical portion abutting the head member 40 and a horizontal portion 42 extending axially of the .pin 38 through the entire thickness of the cover plate 30. Said cover plate is preferably formed of a die cast material and the attaching member 4| is placed in the mold and is secured in position when molding the member 30.

The distributor 31 is provided with an annular flange 43 which is rotatably fitted in a cylindrical bore 44 formed in the cover member 30.

A sealing gasket 46 is fitted in a recess cut into the face of the bore 44. Said sealing member abuts an insert 46 carried by the distributor member, sealing passage of any dirt or ozonized gases from the distributor chamber into the compartment containing the gearing, which will be hereinafter described. Said sealing member also pre vents the loss of lubricant from the gearing compartment.

outwardly beyond the cammed portion 33 of the shaft 14, a driving extension 41 is provided, said extension being formed as a stub shaft with diametrically opposite wing portions 48. It will be noted by inspection of Figure 5 that the wing portion forms a key which is offset from the center of the stub shaft 41. A distributor gear 50 has a hub which is provided with an oifset slot 5|, as best shown in Figure 6. Said gear is adapted to be slidably fitted in the driving extension 41 being engageable in only one angular position.

The gear 50 meshes with and drives an internal gear 52 formed on the annular flange 43 of the distributor 31. A plate 54 fills in the opening on the breaker side or the cover member 30, being secured to the member 30 by a screw 55. Said plate is removable for access to the drive gear 50. A seal 56 is provided around the hub of the gear 50 to prevent the entrance of dirt and the escape of lubricant. A washer 51 or oil absorbent material is formed between the attaching member 4| and the adjacent end of the gear 50, being car ried in a recess formed in said gear.

The distributor 31 carries a conductor Bl positioned to engage a spring pressed contact member 59 carried in a high tension terminal M. The terminal 60 is molded in a distributor cover OI. Said cover also carries, molded in position, the terminals 62, which are provided to connect with wires leading .to the spark plugs or an engine. The cover Si is provided with a flange portion 83 which engages a mating flange portion 64 formed on the cover member 30. Bow-springs l5 pivotally connected to the cover member I0 have hooked portions for engaging notches it provided at the proper location on the cover M. A transparent window 61 is provided on the cover 60 for visually locating the distributor 31 in the proper timed location when connecting the drive gear 50 with the armature shaft.

The same numbers have been used on the drawings in Figures 2, 3 and 4, which are similar except that they may be considered as an exploded view, the diflerent assemblies making up the magneto being removed from their operative position. The cover 6| may, or course, be removed to inspect the distributor contacts. As the cover can be fitted in only one position, there can be no disruption of the timing by removing said cap. It is, however, very essential that means be provided for inspecting and adjusting the breaker mechanism contained in the compartment 28. The cover I may be first removed, as shown, or the entire assembly including said cover, the distributor, the cover member 30 and the gearing carried thereby may be removed as a unit by removing the screw 3! and similar securing means, not shown. The hub of the driving gear 50, which is slidably mounted on the driving extension 41, slides axially oil. the driving key and permits removal of the entire unit.

When reassembling the unit, the gear 50 can be mounted on the extension 41 in only one angular position. This limits the positions of the distributor to two positions degrees apart. This condition is due to the gear ratio between the driving gear III and the internal gear 52, which is 2 to 1. It is, therefore, necessary to have some mark on the distributor 31, preierably at the top, which may be readily identified and which can be located without any chance of error. With the mark approximately in the correct timing relation, it will be necessary to adjust to the correct position before the driving gear 50 can be mounted on the driving extension 41. By means of the window 61, a mark on the distributor 31 can be viewed which will permit very accurate alinement. It is relatively easy to obtain a correct timing relation with a construction of this type, as only two positions are possibl Where a construction is utilized in which gears may be unmeshed, it is very necessary that the exact gear tooth alinement be obtained. The motor may runction with the timing a tooth or two out, but with very poor results.

It will be noted that the sealing member 4| prevents the escape of lubricant from the gear compartment and prevents the entrance thereinto or any of the ozonized air, which tends to oxidize the oil and cause other operating diniculties. Likewise the seal 56 seals the other opening from the gear compartment, preventing the escape of lubricant and the circulation or air which is about to be ozonized by sparks generated during operation oi. the breaker assembly. It will be noted that a seal Cl is formed to prevent the escape of lubricant from the ball bearing assembly l6 and to prevent the circulation or gases therethrough. Attention is also called to the ventilating duct 69 formed in the bottom 0! the housing ll. Said duct is formed by coring a recess in the housing from end to end. A wedgeshaped member 10 is then inserted in the recess to form a tortuous passage to provide a ventilating duct for the rotor portion of the magneto.

In the modification shown in Figure 7, the housing l0 and the associated parts including the armature shaft and the breaker mechanism have been given the same numbers as the corresponding parts in the form shown in Figures 1 to 4, inclusive. In this modification, a closure and supporting member in the form or a cover plate 1| corresponding generally to the cover member I! in the iorm already described, tits on the flange ll 0! the housing II in the same manner. Cap-screws 12, one of which is shown, secure the cover plate on the housing. Bald plate is formed with a recess 13 cooperating with the chamber 20 to term the compartment for the breaker mechanism. A distributor cover 14 is provided with a flange 1| to center and seat the cover on s cooperating seat iormed on the cover plate 1|. Bow- {the distribution of lubricant.

springs 10 removably maintain the distributor cover in position.

The cover member II, which is preferably formed as a die cast member of non-magnetic material. carries a stub shaft 11. Said shaft, as illustrated, is mounted on the plate by being placed in the mold and secured in position by casting. A distrbutor gear 18 is formed with a sleeve-like hub 19 rotatably mounted on the shaft 11. As illimtrated. an annular groove is cut around the stub shaft 17 to provide for A bore M is also formed from the outer end of the stub shaft 11. A lubricant conduit 82 is drilled diagonally through the stub shaft 11 to communicate with the bore 8| and the annular groove 80. To deliver lubricant to the conduit 82, a passage 83 is formed in the cover member H communicating with the upper end of the conduit 82. A distributor 84 is mounted on one end of a sleeve member 85 of electrical insulating material. Said sleeve member is rigidly mounted on the hub portion I9 of the gear 18 for rotation with said gear. cooperates with the hub portion 11 of the gear to form a lubricant reservoir. The outer annular end portion 86 of the member 85 is provided with a notch 81 positioned to engage a driving lug 88 on the distributor 84. Said distributor is slidably fitted on the member 85 and may be readily removed, being replaceable in only one angular position. The sleeve member 85 and the distributor 84 constitute a distributor assembly.

The distributor 84 carries a conductor 89 positioned to engage a spring pressed contact 90 mounted in a high tension terminal 9! molded in the distributor cover. The sleeve member is hollowed out to provide air spaces, which, together with the insulating material of the sleeve member and the partition 86 formed in the sleeve member 95, cooperate with the distributor 84 to provide electrical insulation for the conductor 89 carried by the distributor 84. The conductor 89 is arranged to pass adjacent terminals 92 during rotation of the distributor. Said terminals, only one bf which is shown, are arranged in bosses 93, which are adapted to carry wires leading to spark plugs.

A distributor driving gear 94 is positioned in mesh with the ear 18. A hub extension 95 of said gear is oosely fitted in an opening 98 formed in the cover member II. A sealing member 91 seated in a recess formed in the member 1| engages the hub extension 95 to form a seal against the escape of lubricant, the entrance of dirt, and the circulation of ozonized air.

The hub extension 95 is provided with a key slot slidably engageable with the key formed on the shaft extension 41 exactly as illustrated in Figures 5 and 6. To'maintain the gear 94 in axial position, a rubbing member 98 abuts a recess formed in the end of the gear and a plate 99 which forms a part of the cover structure for the lubricant jcontaining chamber.

A cap W0 is formed with an opening through which the sleeve'member 85 extends. The plate 99 cooperates with a spaced portion of the cap I00 around the member 85 to provide a seal. A sealing member ml is mounted between said elements in frictional engagement with the outside surface of the sleeve member 85. The cap I00 is also provided with a laterally extending flange I02, which abuts a surfaced portion of the cover member 15, being secured thereto in A partition 86 in the sleeve member 85 lubricant tight position by cap-screws i03, one of which is shown in the drawings.

The modification shown in Figure 7 has not been shown with the units removed, it being understood that the cover plate Ii is removed in the same manner as the cover plate 30, carrying with it the distributor drive gearing, which is maintained in meshing relationship. To assemble the unit in the proper timed relation, it is only necessary to observe a mark on the distributor 84, as there are only two positions of lubrication is needed only at intervals, and

ozonized air cannot circulate in the lubricant compartment to cause deterioration of the oil.

It will be understood that applicants have shown and described only two preferred embodiments of their improved magneto construction and that they claim all modifications thereof falling within the scope of the appended claims.

What is claimed is:

1. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing, and, in combination therewith, a closure member removably mounted on the casing, adjacent said extending shaft, a distributor member rotatably mounted on the closure plate at the side opposite the shaft, a gear connected to said distributor, a pinion gear mounted on the closure member in mesh with the first mentioned gear, said closure member being formed with an opening located concentrically with respect to the pinion gear, said gear having a hub extending into said opening to position the gear, said extension shaft being formed with driving means engageable with the hub of the pinion gear. said hub cooperating with said closure member to hold the pinion gear in mesh after removal of the closure member whereby the timing relation of the gears is not changed during such removal.

2. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing. and, in combination therewith, a breaker mechanism mounted around the extending shaft, a closure member removably mounted on the casing over the extending shaft and cooperating with the casing to form a closed chamber for the breaker mechanism, a distributor assembly rotatably mounted on the closure plate at the side opposite the chamber, a gear carried by said distributor assembly, and a pinion gear mounted on the closure member in mesh with the first mentioned gear, said shaft extension being formed with a driving element engageable with the pinion gear.

3. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing and said casing being formed with a recessed chamber around the extending end of the shaft, and, in combination therewith, a breaker mechanism mounted around the extending shaft, a closure member removably mounted on the casing over said chamber. a distributor assembly rotatably mounted on the closure plate at the side opposite the chamber, a gear carried by and rotatable with said distributor assembly, a pinion gear mounted on the closure member in mesh with the first mentioned gear, said extension shaft being formed with a driving element on which the pinion gear is slidably and non-rotatably mounted, and a distributor cap mounted on the closure member and enclosing the distributor.

4. In a magneto having a casing and a rotor rotatably mounted therein, said rotor having a shaft extending beyond one end of the casing and said casing being formed with a recessed chamber around the extending end of the shaft, and, in combination therewith, a breaker mechanism mounted in the chamber, said extending shaft being formed with a cam for actuating said mechanism, a closure member mounted on the casing over the chamber formed therein, said member being formed with a recess to cooperate with said chamber to enclose the breaker mechanism, a distributor assembly rotatably mounted on the closure plate at the side opposite the chamber, and a gear carried with said distributor assembly, a pinion gear in mesh with the first mentioned gear, said gears lying in the side of the plate opposite the chamber means extending through the plate connecting the pinion gear with the rotor shaft.

5. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing and said casing being formed with a recessed chamber around the extending end of the shaft, and, in combination therewith, a breaker mechanism in said recessed chamber, a closure member comprising a plate removably mounted on the casing over said chamber, a distributor member rotatably mounted on the closure plate at the side opposite the chamber, a gear secured for rotation with said distributor, and a pinion gear mounted on the closure member in mesh with the first mentioned gear, said closure member being formed with an opening located concentrically with respect to the pinion gear, said gear having a hub extending into said opening and said extension shaft being formed with driving means engageable with the hub of the pinion gear.

6. In a magneto having a casing and rotor shaft projecting therefrom, and, in combination therewith, a breaker mechanism mounted around the projecting shaft, a closure member removably mounted over the breaker mechanism, a driving gear positioned at the outside of said closure member, means extending through the closure member for removably connecting said gear for rotation with the rotor shaft, said gear being removable with the closure member, a driven gear rotatably mounted on the closure member in mesh with the driving gear, and a distributor member rotatable with said driven gear.

'7. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing, and, in combination therewith, a closure plate removably mounted on the casing over said shaft, a stub shaft extending from said plate, a distributor member rotatably mounted on said shaft, a gear rotatable with said distributor, a pinion gear mounted on the closure plate in mesh with the first mentioned gear, said extension shaft being formed with a driving portion removably connected to the pinion gear, and means for enclosing the gears in a lubricant compartment.

8. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing and a breaker mechanism mounted on the casing around said extending shaft, and, in combination therewith, a closure member removably mounted on the casing and enclosing the breaker mechanism, a distributor assembly rotatably mounted on the closure member at the side opposite the breaker mechanism, a gear carried by and rotatable with said distributor, a pinion gear in mesh with the first mentioned gear, means enclosing said gears to form a lubricant compartment, said extension shaft being formed with a driving portion on which the pinion gear is siidably and non-rotatably mounted, and a distributor cap mounted on the closure member and enclosing the distributor.

9. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing and said casing being formed with a recessed chamber around the extending end of the shaft, and, in combination therewith, a breaker mechanism in said recessed chamber, a closure member removably mounted on the casing over said chamber, a distributor assembly rotatably mounted on the closure member at the side opposite the chamber, a gear carried by and rotatable with said distributor, a pinion gear in mesh with the first mentioned gear, said extension shaft being formed with a driving element on which the pinion gear is slidably and non-rotatably mounted, means enclosing said gears and forming a lubricant retaining chamber, and a distributor cap mounted on the closure member and enclosing the distributor.

10. In a magneto having a. casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing, and, in combination therewith, a closure plate removably mounted on the casing over the end of said shaft, a distributor member rotatably mounted on the closure plate, an internal gear carried by said distributor, and a pinion gear mounted on the closure plate and removable therewith, said gear being in mesh with the first mentioned gear, said extension shaft being formed with a driving element removably connected to the pinion gear.

11. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending beyond one end of the casing, and, in combination therewith, a closure plate removably mounted on the casing over the projecting end of said shaft, a distributor member rotatably mounted on the closure plate, an internal gear rotatable with said distributor, and a flange extending from the closure plate and cooperating with the internal gear to form a lubricant compartment, and a pinion gear carried by the closure plate within and in mesh with the first mentioned gear, said extension shaft being formed with a driving element removably connected to the pinion gear.

12. In a magneto having a. casing and a rotor shaft mounted therein, and, in combination therewith, a supporting and closure member removably mounted adjacent one end of the rotor shaft, a driving gear positioned at the outside of said supporting member, means extending through the supporting member for removably connecting said gear for rotation with the rotor shaft, a stub shaft extending outwardly from the supporting member, a distributor member rotatabiy mounted on said shaft, and. an internal gear carried for rotation with said distributor member, said gear being in mesh with the driving gear.

13. In a magneto having a casing and a rotor shaft mounted therein, and, in combination therewith, a closure member removably mounted adjacent one end of the rotor shaft, a driving gear positioned at the outside of said supporting member, means extending through the supporting member for removably connecting said gear for rotation with the rotor shaft, a stub shaft extending outwardly from the supporting member, a distributor member rotatably mounted on said shaft, an internal gear carried for rotation with said distributor member, said gear being in mesh with the driving gear, and lubricant sealing means between each of said gears and the supporting member whereby a lubricant compartment is provided.

14. In a magneto having a casing and a rotor shaft mounted therein, and, in combination therewith, a closure member removably mounted adjacent one end of the rotor shaft. a driving gear positioned at the outside of said supporting member, means extending through the supporting member for removably connecting said gear for rotation with the rotor shaft, a stub shaft extending outwardly from the supporting member, a distributor member removably mounted on said shaft. said member having a flange extending inwardly toward 'the supporting member and said supporting member having a flange extending outwardly in overlapping relation with respect to the first mentioned flange, said flanges cooperating to form a lubricant compartment, and an internal gear carried by the flange on the distributor member in mesh with the driving gear.

15. In a magneto having a casing and a rotor shaft projecting therefrom, and, in combination therewith, a breaker mechanism mounted around said projecting shaft, a closure plate mounted on the casing and enclosing said breaker mechanism, a driving gear mounted on the outside of said closure plate, said gear being in axial alinement with the rotor shaft and being removably connectable therewith in only one angular position, a stub shaft extending outwardly from the cover plate. a driven gear rotatably mounted on said shaft in mesh with the driving gear, an extension sleeve secured to said driven gear, and a distributor member removably mounted in only one angular position on said sleeve for rotation therewith.

16. In a magneto having a casing and a rotor shaft mounted therein, and, in combination therewith, a distributor supporting plate mounted on the casing, a driving gear mounted on the outside of said plate, means for driving said gear from the rotor shaft, a stub shaft extending outwardly from the supporting plate. a driven gear rotatably mounted on said shaft in mesh with the driving gear, an extension sleeve secured to said driven gear, a distributor member removably mounted on said sleeve for rotation therewith, and a cup member enclosing the gears and secured to the supporting plate to form a lubricant compartment, said member being provided with an opening through which the sleeve extension projects.

17. In a magneto having a casing and a rotor shaft projecting therefrom, and, in combination therewith, a breaker mechanism mounted around said projecting shaft, a closure plate mounted on the casing and enclosing said breaker mechanism, a driving gear mounted on the outside of said closure plate, said gearbeing in axial alinemeat with the rotor shaft and being removably connected thereto, a stub shaft extending outwardly from the cover plate, a driven gear rotatably mounted on said shaft in mesh with the driving gear, an extension sleeve secured to said driven gear, said sleeve having a central partition to retain lubricant around the end of the stub shaft, a distributor member removably mounted on said sleeve for rotation therewith, and a cup member enclosing the gears and secured to the cover plate to form a lubricant compartment, said member being provided with an opening through which the sleeve extension projects.

18. In a magneto having a casing and a rotor shaft projecting therefrom, and, in combination therewith, a breaker mechanism mounted around said projecting shaft, a closure plate mounted on the casing and enclosing said breaker mechanism, said plate being provided with an opening concentric with the rotor shaft a driving gear mounted on the outside of said closure late, said gear being provided with a hub extending through said opening in axial alinement with the rotor shaft and being removably connectable therewith in only one angular position, a stub shaft extending outwardly from the cover plate, a driven gear mounted on said shaft in mesh with the driving gear, an extension sleeve secured to said driven gear, said sleeve having a central partition to retain lubricant around the end of the stub shaft, a distributor member removably mounted in only one angular position on said sleeve for rotation therewith, and a cup member enclosing the gears and secured to the cover plate to form a lubricant compartment, said member being provided with .an opening through which the sleeve extension projects.

19. In a magneto having a casing and a rotor rotatively mounted'therein, said rotor having a shaft extending outwardly at one end of the casing, and, in combination therewith, a closure member removably mounted on the casing adjacent the extending shaft, a distributor member rotatably mounted on the outer side of the closure member, agear connecting said distributor member and a pinion gear rotatably mounted on the closure member in mesh with the first mentioned gear, said extending shaft being formed with a driving element removably engageable with the pinion gear, and said closure member including means engageable with said pinion gear to remove the gear upon removal of the closure member and to hold said gear in mesh with the first mentioned gear after removal.

20. In a magneto having a casing and a rotor shaft mounted therein, said shaft extending outwardly at one end of the casing, and, in combination therewith, a closure member removably mounted on the casing adjacent the extending shaft, a distributor member rotatably mounted on the closure plate at the side opposite the rotor shaft, a gear connected to said distributor, a pinion gear in mesh with said gear. said closure member being formed with an opening, and driving means extending through said opening for detachably connecting the rotor shaft extension with the pinion gear, said closure member including means engageable with the pinion gear to remove said gear upon removal of the closure member and to hold said gear in mesh with the first mentioned gear after removal of said member.

WILLIAM F. BORGERD. HAROLD E. KNOPP. PHILIP L. BERTON. 

